Add labels to rewrapper cc compile action. Prevent ccwrapper from being
used in links.

Test: Built aosp-arm64_eng with and without USE_RBE=1

Change-Id: I8d04069219a9467c3de9a028eb68e3115173f1e2
diff --git a/core/rbe.mk b/core/rbe.mk
index 766b121..fb39d51 100644
--- a/core/rbe.mk
+++ b/core/rbe.mk
@@ -21,7 +21,7 @@
   else
     rbe_dir := $(HOME)/rbe
   endif
-  RBE_WRAPPER := $(rbe_dir)/rewrapper
+  RBE_WRAPPER := $(rbe_dir)/rewrapper --labels=type=compile,lang=cpp,compiler=clang
 
   # Append rewrapper to existing *_WRAPPER variables so it's possible to
   # use both ccache and rewrapper.